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Senior Notes (Summary of Senior Notes) (Parenthetical) (Details) - USD ($)
$ in Thousands
1 Months Ended 6 Months Ended
Feb. 15, 2030
Oct. 27, 2017
Jul. 31, 2016
Jun. 30, 2022
Dec. 31, 2021
May 31, 2020
Oct. 31, 2017
Jul. 31, 2014
Debt Instrument [Line Items]                
Long-term Debt       $ 1,114,016 $ 1,113,478      
Debt instrument, maturity date       Oct. 31, 2047        
Senior notes 4.25% due 2024 [Member]                
Debt Instrument [Line Items]                
Debt Instrument Interest Rate Stated Percentage       4.25%        
Long-term Debt               $ 300,000
Debt instrument, maturity date       Jul. 31, 2024        
Redemption price, percentage of principal amount       100.00%        
Additional issuance of long-term debt     $ 200,000          
Senior notes 4.00% due 2030 [Member]                
Debt Instrument [Line Items]                
Debt Instrument Interest Rate Stated Percentage       4.00%        
Long-term Debt           $ 400,000    
Debt instrument, maturity date       May 31, 2030        
Senior notes 4.00% due 2030 [Member] | After February 15, 2030 [Member]                
Debt Instrument [Line Items]                
Redemption price, percentage of principal amount       100.00%        
Senior notes 4.00% due 2030 [Member] | Measurement Input, Discount Rate [Member] | Prior to February 15, 2030 [Member]                
Debt Instrument [Line Items]                
Redemption at treasury rate basis point       0.50%        
Senior notes 4.00% due 2030 [Member] | Forecast [Member]                
Debt Instrument [Line Items]                
Redemption price, percentage of principal amount 100.00%              
Senior notes 5.20% due 2047 [Member]                
Debt Instrument [Line Items]                
Debt Instrument Interest Rate Stated Percentage       5.20%        
Long-term Debt             $ 200,000  
Redemption price, percentage of principal amount       100.00%        
Additional issuance of long-term debt   $ 25,000